Sympa vs Postorius
A side-by-side comparison of two self-hosted mail servers options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Sympa | Postorius |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Category | Mail Servers | Mail Servers |
| License | GPL-2.0 | GPL-3.0 |
| Language | Perl | Python |
| Setup difficulty | Hard | Hard |
| Min. RAM | 1,024 MB | 512 MB |
| Deployment | docker, bare-metal, source | docker, source |
| GitHub stars | ★ 315 | ★ 200 |
| First released | 1997 | 2012 |
| Replaces | Google Groups | Google Groups |
What are Sympa and Postorius?
Sympa
Sympa is a comprehensive, scalable mailing list manager widely used by universities and large organizations. It supports advanced moderation, web archives, and LDAP integration.
- Scalable list management
- Fine-grained moderation controls
- Web-based list archives
- LDAP and database integration
Postorius
Postorius is the official Django-based web frontend for administering Mailman 3 mailing lists. It lets list owners and administrators manage subscriptions, settings, and moderation through a browser.
- Mailman 3 admin UI
- Subscription management
- Moderation controls
- Django integration
Sympa vs Postorius: key differences
Sympa is written in Perl, while Postorius is built with Python. Licensing differs — GPL-2.0 for Sympa versus GPL-3.0 for Postorius. Postorius is the lighter option, starting around 512 MB of RAM against 1,024 MB for Sympa. Sympa is the more established project (first released 1997), while Postorius arrived in 2012.
Why pick each one
Choose Sympa if…
- Handles very large list deployments
- Mature and feature-rich
Watch out for
- Complex Perl-based setup
- Dated interface
Choose Postorius if…
- Released under the GPL-3.0 license
- First-class Docker support for quick deployment
- Written in Python
- Lightweight — runs in 512 MB RAM
Frequently asked questions
Is Sympa or Postorius better?
Neither is universally better. Sympa has the larger community; both share a hard setup difficulty, so the decision comes down to features and licensing.
Are Sympa and Postorius free and open-source?
Yes. Sympa is licensed under GPL-2.0 and Postorius under GPL-3.0. Both can be self-hosted at no software cost.
Can I run Sympa and Postorius with Docker?
Sympa: yes. Postorius: yes.
Which is lighter on resources, Sympa or Postorius?
Postorius has the smaller minimum footprint at 512 MB of RAM, compared to about 1,024 MB for Sympa. Real-world usage depends on library size, user count, and enabled features.